Re: Making md5-hash 'mysql compatible'
From: Oscar kind (nobody_at_nowhere.net)
Date: 04 Mar 2004 07:40:41 GMT
Daan <email@example.com> wrote:
> To store a password in a database, I have used MySQL's MD5-function to
> create a hash of the password. Now I have a user who enters a password
> (via an html form) that needs to be checked. I have tried to create an
> md5-hash using the MessageDigest class, but since this works on bytes
> (not on strings), I have not been able to create a hash (as a string)
> that I can compare to the hash string that is stored in the database.
> How can I create a hash of the password that the user enters, such that
> is is equal to the hash in the MySQL database? (provided that the user
> enters the right password)
AFAIK, the MD5 hashing algorithm is the same in both cases (it is a
published algorithm). Thus the trick is to put the same bytes into it as
Assuming that MySQL uses the US-ASCII character encoding, I suspect MySQL
uses these bytes to hash "foo":
Make sure you catch the UnsupportedEncodingException (personally, I
rethrow is as an Error/AssertionError, as I believe it's a JRE
configuration issue, but your opinion may be different).
-- Oscar Kind http://home.hccnet.nl/okind/ Java/J2EE Developer email available on website